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#include "sys.h"
#include "usart.h"
int fputc(int ch, FILE *f)
{
while((USART1->SR&0X40)==0);//循環(huán)發(fā)送,直到發(fā)送完畢
USART1->DR = (u8) ch;
return ch;
}
/*使用microLib的方法*/
/*
int fputc(int ch, FILE *f)
{
USART_SendData(USART1, (uint8_t) ch);
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) {}
return ch;
}
int GetKey (void) {
while (!(USART1->SR & USART_FLAG_RXNE));
return ((int)(USART1->DR & 0x1FF));
}
*/
u8 DMA_Rece_Buf[DMA_Rec_Len]; //DMA接收串口數(shù)據(jù)緩沖區(qū)
u16 Usart1_Rec_Cnt=0; //本幀數(shù)據(jù)長(zhǎng)度
//UART1的GPIO初始化
void UART1_GPIO_Init(void)
{
//GPIO端口設(shè)置
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA時(shí)鐘
//USART1_TX PA.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA9
//USART1_RX PA.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA10
}
//UART1的中斷優(yōu)先級(jí)初始化
void UART1_NVIC_Init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //串口1接收中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//搶占優(yōu)先級(jí)3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子優(yōu)先級(jí)3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根據(jù)指定的參數(shù)初始化VIC寄存器
}
//UART1的DMA初始化
void UART1_DMA_Init(void)
{
DMA_InitTypeDef DMA_InitStructure;
//相應(yīng)的DMA配置
DMA_DeInit(DMA1_Channel5); //將DMA的通道5寄存器重設(shè)為缺省值 串口1對(duì)應(yīng)的是DMA通道5
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART1->DR; //DMA外設(shè)ADC基地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)DMA_Rece_Buf; //DMA內(nèi)存基地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //數(shù)據(jù)傳輸方向，從外設(shè)讀取發(fā)送到內(nèi)存
DMA_InitStructure.DMA_BufferSize = DMA_Rec_Len; //DMA通道的DMA緩存的大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外設(shè)地址寄存器不變
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內(nèi)存地址寄存器遞增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //數(shù)據(jù)寬度為8位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //數(shù)據(jù)寬度為8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //工作在正常緩存模式
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //DMA通道 x擁有中優(yōu)先級(jí)
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA通道x沒(méi)有設(shè)置為內(nèi)存到內(nèi)存?zhèn)鬏?br />
DMA_Init(DMA1_Channel5, &DMA_InitStructure); //根據(jù)DMA_InitStruct中指定的參數(shù)初始化DMA的通道USART1_Tx_DMA_Channel所標(biāo)識(shí)的寄存器
DMA_Cmd(DMA1_Channel5, ENABLE); //正式驅(qū)動(dòng)DMA傳輸
}
//初始化IO 串口1
//bound:波特率
void uart_init(u32 bound)
{
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //使能USART1時(shí)鐘
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA傳輸
//USART 初始化設(shè)置
USART_InitStructure.USART_BaudRate = bound; //串口波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字長(zhǎng)為8位數(shù)據(jù)格式
USART_InitStructure.USART_StopBits = USART_StopBits_1; //一個(gè)停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //無(wú)奇偶校驗(yàn)位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //無(wú)硬件數(shù)據(jù)流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收發(fā)模式
USART_Init(USART1, &USART_InitStructure); //初始化串口1
UART1_GPIO_Init(); //UART1的GPIO初始化
UART1_NVIC_Init(); //UART1的中斷優(yōu)先級(jí)初始化
USART_ITConfig(USART1, USART_IT_IDLE, ENABLE); //開(kāi)啟空閑中斷
USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE); //使能串口1 DMA接收
USART_Cmd(USART1, ENABLE); //使能串口
UART1_DMA_Init(); //DMA功能初始化
}
//重新使能UART1_RX的DMA功能
void UART1_RX_DMA_Enable(DMA_Channel_TypeDef *DMA_CHx)
{
//對(duì)于標(biāo)準(zhǔn)庫(kù)，空閑中先處理完數(shù)據(jù)再停止DMA
DMA_Cmd(DMA_CHx, DISABLE ); //先停止DMA，暫停接收
DMA_SetCurrDataCounter(DMA_CHx, DMA_Rec_Len);//DMA通道的DMA緩存的大小
DMA_Cmd(DMA_CHx, ENABLE); //使能USART1 TX DMA1 所指示的通道
}
//發(fā)送len個(gè)字節(jié).
//buf:發(fā)送區(qū)首地址
//len:發(fā)送的字節(jié)數(shù)
void Usart1_Send(u8 *buf,u8 len)
{
u8 t;
for(t=0;t<len;t++) //循環(huán)發(fā)送數(shù)據(jù)
{
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
USART_SendData(USART1,buf[t]);
}
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
}
//串口1中斷服務(wù)程序
void USART1_IRQHandler(void)
{
u8 Res;
//串口1空閑中斷
if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)
{
/* 1.清除標(biāo)志 */
USART_ClearITPendingBit(USART1, USART_IT_IDLE); //清除中斷標(biāo)志
/* 2.讀取DMA */
USART_ReceiveData(USART1); //讀取數(shù)據(jù)
Usart1_Rec_Cnt = DMA_Rec_Len - DMA_GetCurrDataCounter(DMA1_Channel5); //接收個(gè)數(shù)等于接收緩沖區(qū)總大小減已經(jīng)接收的個(gè)數(shù)
/* 3.搬移數(shù)據(jù)進(jìn)行其他處理 (非DMA串口發(fā)送方式) */
Usart1_Send(DMA_Rece_Buf, Usart1_Rec_Cnt); //將接收轉(zhuǎn)移通過(guò)串口1發(fā)送出去測(cè)試
/* 4.開(kāi)啟新的一次DMA接收 */
UART1_RX_DMA_Enable(DMA1_Channel5); //重新使能DMA，等待下一次的接收
}
}
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